Keyhole-guard.



A. LISSNER. KEYHOLE GUARD. APPLICATION rum) JULY 9, 1912.

1,079,654, I Patented N0v.25,1913.

V IIIIIIIIlIl/l 776 WITNESSES.

14M VIM.

INVENTOR.

I COLUMBIA PLANOGRAPH 60., \IVASHINGTDN. D. c-

UNITED srxrns AtoIsLrssNiiR; or rErscHEN; AUSTRIA-HUNGARY.

KnfHoLE- dniiiti).

, ta as-asses July 9,193112. 's'ei fai area Specification of LettersPatenfi j Patented Nov.

T0 all whom it may concern: n j Be it known that I, Amie Lrssunit, lock: smith, subject of the Emperor of Austria- Hungary, residing at Tetschen a. Elbd'liiis triaungary, have invented certain new and useful Improvements inKeyhole-Guards, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to an improved keyhole guard, which is compulsorily engageable and disengageable together with the outer keyhole-cover. The device is arranged behind the keyhole and permits, when in engaged position, of a lateral displacement of the keyhole-cover to a certain extent only, without the device being influenced itself. The disengagement of the locking device is effected by means of a socket-key, which is introduced into a slot rendered accessible by such a partial lateral movement of the keyhole-cover. Thereby, tumblers connected with the ratchet-bolt, are moved out of an arresting bar and remain disengaged by action of a spring acting upon the ratchet-bolt during the introduction of the key, so that by a further turning of the outer keyholecover, which is then possible, and a consequent movement of the inner ratchet-bolt the keyhole is liberated.

In .the accompanying drawing, the improved device is shown.

Figure 1 is a rear view of the same, with back-wall removed. Fig. 2 is a sectional side view of the same, on the line AB of Fig. 1. Fig. 3 is a cross-section on the line C-D of Fig. 1. Fig. 4 shows a modification of the ratchet-bolt.

The device is separate from the lock proper and is let into the front side of the door so as to be flush therewith, it being fixed thereto by screws 42 inserted from the rear and engaging an upper and lower rigid part u of the device.

The device comprises a casing a, provided in the front side with a slot 7), for the introduction of a socket-key, and further with an ordinary keyhole 0. Over the slot 2) and the keyhole 0 a keyhole-cover cl is pivoted. The pivot of the latter carries within the casing a lock-nut 6 with a ward f. The ward and nut rest in the recess of a keyhole closing ratchet-bolt h movably arranged in guides g. The ward f bears against a shoulder i of the recess, when the keyholecover cl is in closing position (see full lines,

Fig. 1"). In the horizontal plane of the ot b for the insertion or the socketkey, blers Z, which are movably attached to the ratchet bolt h, are arranged so as to engage an arrest-ing bar 70, which is rigidly fixed in the casing. Said tumblers are acted upon by springs q in such a way that their ends m are held in line with a shoulder at of the arresting bar, when the device is in its engaged position (Fig. 3'). The tumblers being mounted at 0 on the ratchet-bolt it, they prevent the latter from being moved to uncover the keyhole, as long as they are in engagement with the arresting-bar.

The operation of the device is as follows :For its disengagement, the keyholecover 65 is laterally moved into the position shown by dotted lines in Fig.1. The slot 6 is then accessible, and the ward f bears against the side 1" opposite to the catch 71 of the recess in the ratchet-bolt h. The socket key 8 being then introduced (Fig. 3), causes the tumblers Z pivoted to the ratchet-bolt h a on bar 70, the spring t moving the ratchetbolt it far enough to allow the ends of tumblers Z to pass shoulder n and to rest upon the surface of the arresting bar 74. The ratchet-bolt h is thus released and the keyhole-cover d can now be turned farther, moving bolt it away from the keyhole, by means of the ward f pressing against the recessside 7". To again lock the keyhole, the cover 03 is moved back over the same, whereby the ratchet-bolt h and thus moves the latter into its initial position. The tumblers Z slide then, by action of their springs g, from the surface of the arresting bar is behind the shoulder 10. of the latter, whereby the keyhole is again closed.

In the modification of the ratchet-bolt h shown in Fig. 4, the forward and backward movement thereof is carried out by the bolt turning on a fixed point to.

I claim:

A keyhole guard, comprising in combination, a casing having in its front side a keyhole and an insertion-slot for a socket-key, a keyhole cover, a pivot pin to mount the latter on the outer side of the casing, a ratchet-bolt arranged within the casing and having a recess, a fixed ward on the pivot pin of the keyhole-cover arranged within said recess and adapted to permit of the keyhole-cover being freely turned so far only to be moved out of alinement with shoulder ward f presses against the shoulder '5 of the that the insertion-slot becomes accessible, an ter being disengaged, substantially as and 10 arresting bar fixed in the casing behind the for the purpose set forth.

insertion-slot, spring-pressed tumblers mov- In testimony whereof I afiix my signature ablymounted on the ratchet-bolt and adaptin the presence of two Witnesses.

ed to normally engage said arresting bar but to be disengaged therefrom upon introduc- ALOIS LISSNER' tion of a socket-key in the insertion-slot, WVitnesses:

and a spring to laterally shift said ratchet- KARL KAUL,

bolt and thus also the tumblers upon the lat- J OSEF WEBER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C, 

